Besides having some really nice art, Stoic Angel actually has a really good ability. Whenever she is on the battlefield, each player can only untap one creature during each turn’s untap phase. She’s also a 3 / 4 flyer with vigilance for only 4 mana, although her casting cost is 1WUG (1 colorless, 1 white, 1 blue, 1 green). Being in three colors obviously limits her playability, especially in Limited. But this Angel is a good creature. It just seems strange to feature her so prominently, isn’t it? That art, though, with a beautiful angel holding an hourglass, is really pretty.
From a players’ standpoint, some were understandably upset to have a $2 card who really only sees play in EDH as a featured card for the set. However, Angels are among the more popular tribes in Magic the Gathering. From a marketing perspective, Wizards clearly felt this was a good card to feature, as she was going to be reprinted in this set, anyway. This is Stoic Angel’s first reprint, after all. It’s also worth pointing out that foil copies have been on the rise in price, due to demand from EDH players looking to foil out their decks.
Stoic Angel is actually a very strong card in EDH, since her ability becomes much more relevant in a multiplayer game. She’s particularly important in decks with Rafiq of the Many as a Commander. By making it very difficult for opponents to keep their creatures untapped, the powerful Soldier can attack undeterred much more often. Derevi, Empyrial Tactician decks also make good use of Stoic Angel as Derevi’s ability allows you to untap more often than your opponent’s will be able to. Jenara, Asura of War is the other Commander that typically plays Stoic Angel alongside, as Jenara is all about stacking up on +1/+1 counters and taking out players with Commander damage.
In any case, Stoic Angel doesn’t have to tap to attack, since she has vigilance. This means that you can easily have two creatures untapped and ready to attack whereas other players will only be able to untap one per turn. In Limited, she’s actually quite powerful. In 60-card Constructed formats, not nearly as much. Still, Stoic Angel is a cool card, just not one worth opening as a rare in a $10 Modern Masters 2017 booster pack. She’s hardly going to sell the set, but it’s a card that hasn’t seen a printing for a long time and was probably overdue for a reprint.